Head-On Collision (Not USA/Can)
The collision pulse is registered in Supplemental restraint system module (SRS) (4/9). When the collision pulse becomes strong enough an activation signal, a current pulse, is sent to:
- front airbags (8/123 and 8/124) and/or
- belt tensioners (8/33, 8/34, 8/55, 8/56, 8/62 and 8/92) and, if necessary, to
- the inflatable curtains (8/66 and 8/67).
Airbags driver and passenger front are activated. Belt tensioners are activated.
Inflatable curtains on driver's side are activated.
In case of a head-on (frontal) collision where front airbags and seatbelt pretensioners have been deployed, the function for adaptive seatbelt force limiter can also be activated.
The passenger airbag will not be activated if it is deactivated with the switch (3/157).
When impact protection has been deployed, the supplemental restraint system module (SRS) sends a collision signal to the central electronic module (CEM) (4/56) and phone module (PHM) (16/60) via a directly connected cable. A collision status signal is also sent to the central electronic module (CEM) and phone module (PHM) on the CAN network. These to control modules ensure that:
- switch off the fuel pump (FP)
- switch off the windshield wipers when the car is stationary
- turn off defrosting of windows and rearview mirrors if the vehicle is stationary
- light the interior lighting
- light the flashing hazard lights
- unlock the central locking system
- send an automatic alarm to CSC (Customer Service Center) when an accident has occurred - provided the vehicle is equipped with Volvo On Call (Plus).
- turn off the fuel engine heater
Supplemental restraint system module (SRS) receives continuous information from Closing velocity module (CVM) (4/125). With laser Closing velocity module (CVM) detects if the vehicle is about to collide with an object in front. Information is used by Supplemental Restraint System Module (SRS) to get an early indication that the vehicle is about to collide, which helps to decide what type of action is needed.